Be aware that that can be dangerous. All kinds of data on your system will be 
upgraded, and won’t work anymore on ElCap. You should only do that if you have 
a backup from ElCap, and use that to install your system.

Christiaan

> On Sep 22, 2016, at 16:57, Chirok Han <chirok....@gmail.com> wrote:
> 
> Many thanks for your quick reply. I'll then have to consider downgrading to 
> El Capitan.
>  
> Chirok
>  
>  
> From: Christiaan Hofman <cmhof...@gmail.com>
> Reply-To: For general discussion about using Skim 
> <skim-app-users@lists.sourceforge.net>
> Date: Thursday, 22 September 2016 at 11:51 PM
> To: For general discussion about using Skim 
> <skim-app-users@lists.sourceforge.net>
> Subject: Re: [Skim-app-users] Skim.app jump to page top when refreshing under 
> Sierra
>  
>  
>> On Sep 22, 2016, at 16:46, Chirok Han <chirok....@gmail.com 
>> <mailto:chirok....@gmail.com>> wrote:
>>  
>> Hi all,
>>  
>> Skim.app is excellent. I use it all the time.
>>  
>> I have a question about Skim's behavior when refreshing a pdf file. Under El 
>> Capitan, when Skim.app reloads a pdf, the viewing position was preserved the 
>> same. For example, if I was viewing the bottom of a page, the position is 
>> still the same.
>>  
>> But this changed after I upgraded the OS to macOS Sierra, which I regret. 
>> Now refreshing makes Skim.app jump to the page top. For example, if I was 
>> viewing the middle of page 3, after the pdf file is changed (usually by 
>> pdflatex), Skim.app changes the position to the top of page 3. On my other 
>> mac running El Capitan, the position does not change. It's only under Sierra 
>> that the position jumps to the top of a page. The version is 1.4.21 (95) on 
>> both machines.
>>  
>> Would there be a way to avoid the position change under Sierra?
>>  
>> Thank you.
>>  
>> Chirok
>>  
>  
> I have had several reports about problems in automatic scrolling in Sierra. 
> It looks like PDFKit has a bug there, when we tell it to scroll to some 
> position it often does not do that. I have reported a bug about this already, 
> but it looks to be a more general problem than I thought at first. 
> Unfortunately there is nothing we can do about this, Apple needs to fix this 
> in PDFKit.
>  
> Christiaan
> 
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Christiaan

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